Warp stop-motion for looms.



PATENTED JULY 7, 1903.

2 SHEETSSHEET 1- A. K. PRATT. WARP STOP MOTION FOR LOOMS. APPLIOA TION FILED MAY 8, 1901.

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No. 733,079. PATEN'IED JULY 7,1903/ A. K. PRATT.

WARP STOP MOTION FOR LOOMS.

APPLICATION PILBD MAY 8, 1901.

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Patented July 7, 1903.

#PATENT OFFICE.

ALBERT K. PRATT, OF WHITINSVILLE, MASSACHUSETTS.

\ NA RP STOP-MOTION FOR LOOIVIS.

SPECIFIGATION'forming part of Letters Patent No. 733,079, dated July '7, 1903. Applicatidn filed May 8,1901. Serial No. 59.283. (N0 model.)

To all whom it may concern:

Be it known that I, ALBERT K. PRATT, a citizen of the United States, residing at Whitinsville, in the county of Worcester and State of Massachusetts, have invented a new and useful Improvement in WVarp Stop-Motions for Looms, of which the following is a specification. i

This invention has reference to an improvement in mechanism controlled by detectorplates supported one oneach warp-thread, by which on the breakingof. awarp-thread the loom is automatically stopped. l

The invention consists in the peculiar and novel construction ofthe actuating mechanism and the combination withthe saw-blade feeler, whereby on the breaking of a warpthread a detector-plate is dropped, the loom is stopped, and then the detector-plate is released automatically, as will be more fully set forth hereinafter.

Figure 1 is an end view of part of a loom, showing the warp stop-motion in connection with the cooperating parts of the loom. Fig. 2 is a rear view, on an enlarged scale, of one of the end frames, showing the connection of the warp stop-motion with the belt-shipper.

Similar marks of reference indicate corresponding parts in all the figures.

In the drawings, Aindicates the end frame; B, the lay; C, the cam-shaft; D, the warpbeam; E, the warp-threads F, the reciprocating feeler device, and G the detector-plates,

' supported each by a warp-thread. In the preferred form a feeler-blade f, provided with a saw-tooth edge, is reciprocated between two fixed saw-tooth blades f f in which the teeth are in the direction opposite to the direction of the teeth in the feeler-bladesf, as is shown in Fig. 2, the construction being duplicated. The detector-plates G are arranged in two groups. Every alternate warp-thread is passed through the eyes of the deteetor-plates of one group and the intermediate warpthread through the eyes of the detector-plates of the other group, as is shown in Fig. 1. 011

the breaking of a warp-thread the corresponding detector-plate drops down and enters the space between the saw-teeth of the stationary and moving feeler-blades, which will stop the movement of the latter and through the mechanism hereinafter described stop the running tion (shown in dotted lines in Fig. 1) may be t operated by the lay as the lay approaches the end of its backward swing.

The rock=shaft f is supported in suitable bearings formed in brackets secured to the end frame and is held against longitudinal movement by collars. On the rock-shaftthe lever f is adjustably secured, and this lever is connected with the arm f by the connecting-rod f adjustably secured in the slotted portion f of the arm f. The arm f is pivoted at one end to the bracket f and has the roller f, journaled in a curved arm. The roller bears on the cam c, by which at each rotation of the cam-shaft the arm f is raised against the tension of=tl1e coiled spring f one end of which is secured to' the end frame and the other end to the arm f The operating mechanism, so far as it has been described, acts to swing the arm f upward at each revolution of the cam-shaft and rock the rock-shaft, so as to draw out the feeler-blades f f and raise the knock-0E bar f into the path of the knock-ofi f on the lay B. The cam o isplaced on the camshaft in such a position that at every other pick the knock-off bar 1"" is raised, while the lay swings through a portion of the rearward swing and is lowered before the knockoff on the lay en counters the shoulder on the knockoff bar. WVhen, however, a warp thread breaks, a detector-plate drops between the teeth of the fixed saw-tooth blad es and-a tooth on the feeler saw-blade, thereby looking the mechanism and arresting the knock-off arm in the raised position. In completing the backward movement of the lay the knock-off on the lay encounters the shoulder on the knock-off arm and drawing the same backward operates the knock-off and stops the loom.

The weight of the arm f and the parts connected with the knock-off arm f assisted by the tension of the coiled spring f, act to hold the detector-plate in the clamped position. These detector-plates are very thin and frail. They require to be raised to thread the warp-thread through them in mending the broken warp and must be released. To overcome this objectionable feature, incident to most automatic warp stop-motions, I connect the actuating mechanism with some operative part of the loom, so that in the act of stopping the loom the operative part may act to release the detector plate or plates.

In the cmodern loom the shipper-lever by which the loom is stopped and started is usually moved against a spring force in starting the loom and is then secured in a notch in the holding-plate, and when released the spring acts to move thelever and operate the shipper to lead the belt from the tight pulley to the loose pulley, and so.stop the loom. In carrying out my invention I have selected moving parts of the belt-shipper and have connected them with the arm f As shown in Fig. 2', the chain (1, having on one end the link d, is connected on the other end adjustably to the post (1 secured to the sleeve (1 sliding on the stud d. The sleeve 61 is part of the belt-shipper. A pin d on the arm f extends into the link d. As the sleeve d moves outward on the stud (Z the chain d, passing overapulley d journ aled on a bracket projecting from theframe, draws the link d upward until the link engages with the pin 61* and draws the arm f upward sufficiently to release, through the rock-shaft and the lever-f the strain of the feeler saw-blade on the detector-plate.

I do not wish to confine myself to any particular construction of mechanism for connecting the feeler-actuatin g mechanism with an operating part of the loom, as the same may be modified to best suit the construction ofthe loom.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a warp stop-motion, the combination with the saw-tooth feeler of the detector meclr anism, the lay, and a knock-off bar, of a rockshaft, a lever on the rock-shaft for operating the feeler and means on the rock-shaft for controlling the knock-off bar, a cam, and actuating mechanism intermediate the cam and the rock-shaft, as described.

2. A warp stop-motion having a detector mechanism comprising a feeler, a rock-shaft for operating the same, a lever and cam for actuating the rock-shaft, a knock-ofi mechanism connected with the rock-shaft, in comating mechanism, and reciprocating mechanism connected with the feeler-operating mechanism for looseningthe clamping action of the feeler on the detectors, as described.

4. In a warp stop-motion the combination with detector-plates and feeler-blades, of mechanism for reciprocating the blades, a knock-off bar, a lay, means on the lay and bar for throwing the shipper, and means on the frame including a stud and a sliding sleeve forming part of the belt-shipper and connections between the sleeve and the feeleractuating means, substantially as described.

5. In a warp stop-motion for looms, the combination with detector plates and feelerblades, of means for actuating the feelerblades, a shipper for the loom, a knock-off bar for releasing the shipper, means for actuating the knock-olf bar, a stud on the loom-frame, a sliding sleeve on the stud, and a flexible connection between the sleeve and the feelerblade-actuating means, whereby the pressure of the feeler-blades on the detectors may be lessened before the machine is'stopped, substantially as described.

6 In a warp stop-motion for looms, the combination with detector-plates and feelerblades, of a knock-off bar and a shipper released thereby, means for operating the knock-off bar, a rock-shaft for actuating the feeler-blades, a lever moving the rock-shaft,

a cam for operating the lever, a stud on the loom-frame, a sliding sleeve forming part of the belt-shipper on the stud, and a chain connecting the sliding sleeve with the cam-operated lever whereby the feeler is operated to release the detector-plate, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALBERT K. PRATT.

VVit-nesses:

G. H. GoonELL, A. S. NoYEs. 

